Get rid of NULLs in xfa/

xfa/fxfa/parser/xfa_document_datadescription_imp.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fxfa/parser/xfa_doclayout.h"
 #include "xfa/fxfa/parser/xfa_document.h"
 #include "xfa/fxfa/parser/xfa_localemgr.h"
 #include "xfa/fxfa/parser/xfa_object.h"
@@ skipping 50 matching lines @@
       break;
     }
   }
 }
 CXFA_Node* XFA_DataDescription_MaybeCreateDataNode(
     CXFA_Document* pDocument,
     CXFA_Node* pDataParent,
     XFA_ELEMENT eNodeType,
     const CFX_WideString& wsName) {
   if (!pDataParent) {
-    return NULL;
+    return nullptr;
   }
   CXFA_Node* pParentDDNode = pDataParent->GetDataDescriptionNode();
   if (!pParentDDNode) {
     CXFA_Node* pDataNode =
         pDocument->CreateNode(XFA_XDPPACKET_Datasets, eNodeType);
     ASSERT(pDataNode);
     pDataNode->SetCData(XFA_ATTRIBUTE_Name, wsName);
     pDataNode->CreateXMLMappingNode();
     pDataParent->InsertChild(pDataNode);
     pDataNode->SetFlag(XFA_NODEFLAG_Initialized, false);
@@ skipping 29 matching lines @@
       if (eNodeType == XFA_ELEMENT_DataValue &&
           pDDNode->GetEnum(XFA_ATTRIBUTE_Contains) ==
               XFA_ATTRIBUTEENUM_MetaData) {
         pDataNode->SetEnum(XFA_ATTRIBUTE_Contains, XFA_ATTRIBUTEENUM_MetaData);
       }
       pDataParent->InsertChild(pDataNode);
       pDataNode->SetDataDescriptionNode(pDDNode);
       pDataNode->SetFlag(XFA_NODEFLAG_Initialized, false);
       return pDataNode;
     }
-    return NULL;
+    return nullptr;
   }
 }